How to use the online alarm clock
Waking at 12:51 pm means your visit to see the Changing of the Guard has not begun yet, so pause long enough to get fully alert before rushing out. Set the alarm for the moment you need to start preparing, and use the approach of 1:00 pm as a clear boundary between waking up and gathering what you need for the journey.
Because this alarm is tied to a specific outing, test its sound now rather than discovering a problem when the reminder is due. Check that it is clearly audible at your chosen volume, then reset it for 12:51 pm. If the browser is no longer running when the time arrives, the alarm will stay silent and you could miss your cue to leave for the Changing of the Guard.
A late start around midday can make an alarm harder to notice: traffic, voices and household activity often compete with its tone as lunchtime approaches. Keep the sound source close rather than across the room, and avoid placing it beside an open window. If other people are nearby, tell them what the 12:51 pm signal means so it is not dismissed as background noise while you are getting ready for the palace.
Common questions
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
What happens if my laptop goes to sleep before 12:51 pm?
The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
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